Beadalon Pearl Reamer, Fine This tool is extremely delicate. It cannot be used on stones, only natural pearls Be sure to hold reamer straight while using. Twist slowly and apply only gentle pressure Rinsing the pearl while reaming will reduce dust Designed to enlarge and smooth out drill holes in pearls Made in USA Sharp, corkscrew-like file fits easily into the hole of any small pearl Simply slide a pearl onto the file, and slide the pearl back and forth until desired interior diameter is reached Also a great tool for removing the white release clay from lamp work glass beads